Structure and Composition of Nanometer-Sized Nitrides in a Creep-Resistant Cast Austenitic Alloy

The microstructure of a new and improved high-temperature creep-resistant cast austenitic alloy, CF8C-Plus, was characterized after creep-rupture testing at 1023 K (750 °C) and 100 MPa. Microstructures were investigated by detailed scanning electron microscopy, transmission electron microscopy, and...

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Vydané v:Metallurgical and materials transactions. A, Physical metallurgy and materials science Ročník 41; číslo 12; s. 3032 - 3041
Hlavní autori: Evans, Neal D., Maziasz, Philip J., Shingledecker, John P., Pollard, Michael J.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Boston Springer US 01.12.2010
Springer
Springer Nature B.V
Predmet:
ALLOYS
Applied sciences
austenitic stainless steels
CF8C-Plus
Characterization and Evaluation of Materials
Chemistry and Materials Science
CREEP
Exact sciences and technology
MATERIALS SCIENCE
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metallic Materials
Metallurgy
Metals. Metallurgy
MICROSTRUCTURE
MORPHOLOGY
Nanotechnology
NITRIDES
PHASE STABILITY
PRECIPITATION HARDENING
SCANNING ELECTRON MICROSCOPY
SIMULATION
Stainless steel
STAINLESS STEELS
Structural Materials
Studies
Surfaces and Interfaces
TESTING
THERMODYNAMICS
Thin Films
TRANSMISSION ELECTRON MICROSCOPY
X-RAY SPECTROSCOPY
Interdendritic Region
Component Spectrum
M23C6 Carbide
Spectrum Image
Austenite
Mechanical properties
Nitrides
Austenitic alloy
Foundry
Creep
Cast alloy
ISSN:1073-5623, 1543-1940
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Popis
Shrnutí:The microstructure of a new and improved high-temperature creep-resistant cast austenitic alloy, CF8C-Plus, was characterized after creep-rupture testing at 1023 K (750 °C) and 100 MPa. Microstructures were investigated by detailed scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy (EDS). Principal component analysis of EDS spectrum images was used to examine the complex precipitate morphology. Thermodynamic modeling was performed to predict equilibrium phases in this alloy as well as the compositions of these phases at relevant temperatures. The improved high-temperature creep strength of CF8C-Plus over its predecessor CF8C is suggested to be due to the modified microstructure and phase stability in the alloy, including the absence of δ -ferrite in the as-cast condition and the development of a stable, slow-growing precipitation hardening nitride phase—the tetragonal Z-phase—which has not been observed before in cast austenitic stainless steels.
Bibliografia:SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 14
DE-AC05-00OR22725
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-010-0321-4